Coring apparatus



Dec. 29, 1942. D'. D. ANDERSON 2,306,369

` coRING APPARATUS Y K Filed sept.' 22, 1941 El rwwmwg Hbc/arson,

Patented Dec. 29, 1942 CORING APPARATUS Dwight D. Anderson, Houston,

Tex., assigner to Reed Roller Bit Company, Houston, Tex., a corvporation of Texas Application September 22, 1941, Serial No. 411,822

-3 Claims. (Cl. Z55-72) This invention relates to coring apparatus andhas for its general object the provision of a coring apparatus in whichthe core will be protected from disintegration during the coringoperation.

In the usual coring apparatus a core drill is employed which makes anannular cut and leaves a core standing in the center of the hole cut.This core is received within a core barrel normally disposed within thecore drill and extending upwardly therefrom into the drill collar ondrill stem. Some such core barrels are fixed in place and can only beremoved by removing the drill from the hole, while others are adaptedto.

be removed by means of a wire line after a core has been taken. In everyinstance, however,'the core is fed into the core barrel, and it has beenfound that under many circumstances it will, in feeding into the corebarrel during the cutting of the core, tend to disintegrate because ofits rubbing action against the wall of the core barrel, and may jam upin the core barrel and prevent the taking of additional core.

It is an object of this invention to provide a. means which willmaintain a space within the core barrel between the walls of the corebarrel and the body of the core, so that iiuid may ow around the core`and keep it lubricated at all times.

It is a further object of this invention to provide such a device whichwill prevent disintegration of the core and will also tend to preventthe core from jamming in the core barrel.

A further object of this invention is to provide such a structure whichwill be extremely simple and inexpensive, which will be fool-proof andrequire substantially no attention, which will take up very little spacewithin the core barrel and will not interfere with the movement of thecore, and which will accommodate a core of substantially any lengthdesired.

Other objects and advantages of this invention will become apparent fromthe following description taken in connection with the accompanyingdrawing, wherein is illustrated one embodiment of the invention.

In the drawing: s

Fig. 1 is a View in vertical cross section showing a coring apparatuswithv the protector constructed in accordance with this invention `inplace therein and illustrating the action of the device during thetaking of a core;

Fig. 2 is a vertical cross section through a portion of the` core barrelillustrated in Fig. 1 and showing the manner of mounting this inventionin place therein.

In the drawing the numeral I designates the usual drill collar to whichis secured on its lower end the drill bit 2 by means of the threads 3.'I'his drill bit 2 is provided with cutting blades 4 of any desirednumber and type and with slush passages 5 leading to the cutting blades.

Within the bit head of the bit 2 and above the blades thereof isdisposed the seating ring 6 that is adapted to receive the shoulder 'lon the nipple 8 forming a part of the core barrel, this being attachedto the lower end of the core barrel proper indicated at 9. On the lowerend of the nipple 8 is carried the c oring head I0 and within thiscoring head ismounte'd the core catcher II which serves to break off thecore when the core barrel is raised and retain the core in the corebarrel while it is being removed from the hole.

The upper portion of the nipple 8 is formed with substantially the sameinternal diameter as the core barrels, but adjacent its lower end thisnipple 8 is formed with `a part of smaller internal diameter I2. At thepoint of juncture between these portions of larger and smaller diameterthere is provided'a radially extending circumferential groove diameterthan the upper portion of the nipple 8.

Disposed initially within the nipple 8 is the spring I4. This spring hascoils of substantially the sainek diameter throughout the major portionof its length but of progressively smaller diameter adjacent its upperend as shown at I5 to substantially close the upper end of the spring.At its`lower end this spring is formed with one turn I5 of largerdiameter than the remaining` turns of the spring, this turn of thespring being adapted to t within the'groove I3 so as to retain-the lowerend of the spring against upward or downward movement within the nipple8. The spring I4 is made very flexible so that it may stretch easily theentire length of the core barrel and accommodate a core of full lengthwithout the exertion of a large amount of force thereon. Also, it ismade of a relatively iine gauge of wire so that it will occupy butlittle space within the l core barrel and will leave the core free tomove upwardly in the core barrel without interference, serving only tospace the core from the walls of the core barrel in order that uid mightcirculate between the core and the core barrel.

In operation, the spring I4 will be inserted into place in the nipple 8before the core barrel is assembled. After assembly the core barrel,with the spring in place therein and in the condition illustrated inFig. 2, will be lowered into the hole. The drill stem will then berotated to cause the I3 that is of even greater internal drill I todrill ahead and form the core l1 at the center of the hole. As this coreis formed it will advance upwardly in the core barrel and upwardlythrough the hollow central portion of the spring Il until it comes incontact with the upper end thereof. Thereupon it will lcontinually moveupwardly stretching the spring Il as it moves but during the entiremovement from the time it enters the lower end of the spring Il it willbe held out of contact with" the wall of the core barrel and fluid maycirculate therebetween. It will be prevented from disintegrating contactwith the wall of the core barrel and will be held together so as toprevent it from Jamming up in the core barrel.

Having described my invention, I claim:

l. In a coring device, a core drill, a core barrel therein, and anextensible coil spring within said core barrel adapted to receive a coreentering said core barrel and to space the same from the walls of saidcore barrel, said coil spring having a turn adjacent t`s ameter than theremainder of said spring, and said turn of larger diameter beingdisposed within a circumferential groove inside said core barrel toprevent upward movement of the lower end of said spring.

2. In 'a coring device. a core drill, a core barrel lower end ofsubstantially larger dicore barrel adapted to receive a core enteringsaid core barrel and to space the same from the walls of said corebarrel, said coil spring being substantially closed at its upper end andhaving its lower end anchored to the inner wall of said core barreladjacent the lower end of said core barrel.

3. A spacer for spacing a core from the interior of a core barrel andfor holding said core together'to prevent its disintegration, saidspacer `comprising a helically wound coil of spring wire of a diameteradapted to fit within said core barrel, said wire being formed with aturn of larger diameter than the remainder of the turns at one endthereof whereby it may be anchored to the interior of said core barrel,and being formed with turns of smaller diameter than the remainder ofits turns adjacent the opposite end thereof to substantially close theupper end of Vsaid spacer and prevent a core from passing out throughthe upper end thereof.

DWIGHT D. ANDERSON.

